How does breathing change during the free-burning phase?

During the free-burning phase of a fire, the conditions often become increasingly hazardous due to the presence of smoke, heat, and toxic gases. As the fire grows and consumes materials, it generates a significant amount of smoke that contains harmful byproducts, which can severely hinder an individual's ability to breathe.

Initially, breathing may start to become more difficult as smoke begins to fill the environment, and the air quality deteriorates. As the fire continues to intensify, the concentration of smoke and toxins can reach levels that make breathing impossible, leading to a critical situation for anyone in the vicinity of the fire. This progression from difficulty in breathing to an extreme state where breathing becomes nearly impossible illustrates the severe impact that the free-burning phase can have on respiratory function.

This understanding is crucial for individuals in fire-related roles, as it underscores the importance of using protective equipment and following safety protocols to mitigate the risks associated with smoke inhalation during such phases of a fire incident.